Anyone done G7 methodology?

[Skinflint]

I was wondering what stocks people are using for the calibration. I am having difficulty locating a sheet that meets the specs.

 

[meddington]

I was wondering what stocks people are using for the calibration. I am having difficulty locating a sheet that meets the specs.

Out of curiosity, what are the CIELab values of your current house stock? If optical brightener content isn't too heavy, there might not be a benefit in calibrating to a paper different than the stock used day to day

 

[Skinflint]

Out of curiosity, what are the CIELab values of your current house stock? If optical brightener content isn't too heavy, there might not be a benefit in calibrating to a paper different than the stock used day to day

I'll get that Monday and post it.

How do I know if the brightener content is too heavy?

"there might not be a benefit in calibrating to a paper different than the stock used day to day" Are you saying that do the G7 would not be of benefit or just the fact of using a stock other than the house sheet?


Thanks for your reply..

 

[meddington]

How do I know if the brightener content is too heavy?

No set rules, but if your getting a b* value of say =/< -5, OB content is likely getting up there.

Are you saying that do the G7 would not be of benefit or just the fact of using a stock other than the house sheet?


Thanks for your reply..

Definitley a benefit to calibrating' just might not be worth while to purchase stock special stock different from your house stock if you have no intention of using it in production.

 

[Skinflint]

No set rules, but if your getting a b* value of say =/< -5, OB content is likely getting up there.



Definitley a benefit to calibrating' just might not be worth while to purchase stock special stock different from your house stock if you have no intention of using it in production.

I'll check and post the info...

Thanks Again..

 

[Skinflint]

No set rules, but if your getting a b* value of say =/< -5, OB content is likely getting up there.



Definitley a benefit to calibrating' just might not be worth while to purchase stock special stock different from your house stock if you have no intention of using it in production.

I have the Lab values...

G7 methodology requires L 95 +-3 a 0 +-2 b -2 +-2

Our house EuroArt is L 96.39 a 1.27 b -4.20

Do you think this would fly with Ideaalliance?

 

[rich apollo]

The method will work fine with the stock you have. You'll want to set the gray balance relative to the sheet.

We're running it here on newsprint, SCB, and #5 gloss.

 

[Chicago Press]

We have been using the G7 process for 2 years now and even though our shop does not run in ideal conditions, it has made a HUGE difference. We have not had our press sheet certified, only our proofs. But despite that, our printing is much better (less problems with too red in our case) and we don't drive the pressmen crazy trying to match a proof they can't match. The consistency between proof and press is great, even though we only use one profile for coated and one for uncoated. We haven't taken the time or expense to profile many papers. You do have to commit to getting the tools to create the profiles and to taking the time periodically to reprofile when something changes. We find that to make new sets of profiles for coated and uncoated, which involves getting on press twice, takes a little less than one shift. Everyone here from sales to pressroom loves it. We did bring in a consultant to set it up for us and teach us how to go forward on our own. He was great, I can highly recommend him if you're interested.

 

[Deleted member 16349]

We have been using the G7 process for 2 years now and even though our shop does not run in ideal conditions, it has made a HUGE difference. We have not had our press sheet certified, only our proofs. But despite that, our printing is much better (less problems with too red in our case) and we don't drive the pressmen crazy trying to match a proof they can't match. The consistency between proof and press is great, even though we only use one profile for coated and one for uncoated. We haven't taken the time or expense to profile many papers. You do have to commit to getting the tools to create the profiles and to taking the time periodically to reprofile when something changes. We find that to make new sets of profiles for coated and uncoated, which involves getting on press twice, takes a little less than one shift. Everyone here from sales to pressroom loves it. We did bring in a consultant to set it up for us and teach us how to go forward on our own. He was great, I can highly recommend him if you're interested.

What were you doing before that was not working out so well?

Thanks for any comments.

 

[Chicago Press]

We were using some curves on our plates and proofs that our major pre press vendor had set up years before that no one here understood. I still don't know what logic or system they were based on, or if they even were based on any real, measured data. That is part of the key of making G7 work: being able to measure what you're doing. It was a big investment to buy the spectrophometer and the software to go with it, but it's been totally worth it. We are much more in control of our process now.

 

[Skinflint]

We were using some curves on our plates and proofs that our major pre press vendor had set up years before that no one here understood. I still don't know what logic or system they were based on, or if they even were based on any real, measured data. That is part of the key of making G7 work: being able to measure what you're doing. It was a big investment to buy the spectrophometer and the software to go with it, but it's been totally worth it. We are much more in control of our process now.

What software did you have to purchase?

 

[Chicago Press]

We are using Monoco Profiler with the XRite DTP70 spectro.

 

[Skinflint]

We were using some curves on our plates and proofs that our major pre press vendor had set up years before that no one here understood. I still don't know what logic or system they were based on, or if they even were based on any real, measured data. That is part of the key of making G7 work: being able to measure what you're doing. It was a big investment to buy the spectrophometer and the software to go with it, but it's been totally worth it. We are much more in control of our process now.

What do you do when you need to adjust the curves that you are currently using?
Say for example something changes ie: blankets, ink etc..